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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 01-28-2006, 02:58 PM   #1 (permalink)
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Lift pump cam lobe worn off motor.

this common? have a 88, had a brand new IH motor installed in 93, motor got around 100k on it, and wore lift pump lobe off the cam, common problem? just gonna run an electric pump....
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Old 01-28-2006, 03:35 PM   #2 (permalink)
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Re: Lift pump cam lobe worn off motor.

Never seen first hand but heard of it... Yeppers just do the electric and call it a day...

Remember the block off plate is for a Chevy Big Block - fits like a glove...
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Old 01-28-2006, 03:44 PM   #3 (permalink)
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Re: Lift pump cam lobe worn off motor.

You can get the Facet-Purolator Pump available from NAPA - Belkamp label, NAPA Part# 6101050, only $36 out the door. Mount it on the frame rail, just in front of the fuel tank selector valve. They push better than they pull.
You MUST also buy a 'Big Block Chevy Block Off Plate while you are at the parts store ~ $5. When you remove the mech pump you cover the hole in the block with the 'Block-off plate'
When you change the fuel filter, next time, you don't have to worry about filling the fuel filter with diesel before you spin it back on. After it's tighten up, just turn on the e-pump and it'll fill right up. You can get a Holly Red pump from Summit Racing for $95.88. You should also get the Oil Pressure Saftey Switch also available from Summit for $19.88. You can buy a generic Oil Pressure Saftey Switch that 'open'(turns off the current/circuit) when the oil pressure drops below 4-6lbs. I have a by-pass switch on my oil pressure saftey switch for those times when I want the pump to pump fuel up even though the engine isn't running. Click on the "E-pump Wiring diagram in my Signature. If you want a printable/readable version, send me your email address. OkieGringo
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<font color="red">1987 F350, 4X4, Crew Cab, DRW, w/'91 7.3 TURBO-CHARGED BY ATS, no-Wastegate(Turbo rebuilt by me 7/2005)</font>, <font color="blue">E4OD Auto, Aux Trans Cooler w/12" fan, w/Baumann Programable Trans Computer-12/05</font>, Rebuilt Injection Pump-2/03, Electric Fuel Pump, Coolant Filter, "BajaGringo Block Drains, 5-Row Radiator Core-9/04, 2 New Plastic Fuel Tanks w/new Sending Units/Pickups, Fuel Filler Neck Mods, Air Ram Intake, Air-Lift SuperDuty AirBags with Smart Lift Auto Leveling-7/2005 <font color="blue">Link to Photo of "OkieGringo Idler Pulley"</font>
<font color="red">Link to GP Controller Diagram</font> <font color="blue">Link to "Electric Fuel Pump Wiring Diagram"</font>
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Old 01-28-2006, 09:33 PM   #4 (permalink)
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Re: Lift pump cam lobe worn off motor.

i put a john deere electric pump on it.
as far as a block off plate, i just cut the arm off the mechanical pump and reinstalled it.
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Old 01-28-2006, 11:17 PM   #5 (permalink)
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Re: Lift pump cam lobe worn off motor.

That's not a bad idea, as long as you ran the fuel line AROUND the old pump. You don't want the fuel under pressure blowing the rubber diaphram out and FILLING UP THE CRANKCASE WITH DIESEL [img]/ubbthreads/images/graemlins/eek.gif[/img]. That would not only ruin your day. [img]/ubbthreads/images/graemlins/smokin.gif[/img]OkieGringo
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<font color="red">1987 F350, 4X4, Crew Cab, DRW, w/'91 7.3 TURBO-CHARGED BY ATS, no-Wastegate(Turbo rebuilt by me 7/2005)</font>, <font color="blue">E4OD Auto, Aux Trans Cooler w/12" fan, w/Baumann Programable Trans Computer-12/05</font>, Rebuilt Injection Pump-2/03, Electric Fuel Pump, Coolant Filter, "BajaGringo Block Drains, 5-Row Radiator Core-9/04, 2 New Plastic Fuel Tanks w/new Sending Units/Pickups, Fuel Filler Neck Mods, Air Ram Intake, Air-Lift SuperDuty AirBags with Smart Lift Auto Leveling-7/2005 <font color="blue">Link to Photo of "OkieGringo Idler Pulley"</font>
<font color="red">Link to GP Controller Diagram</font> <font color="blue">Link to "Electric Fuel Pump Wiring Diagram"</font>
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Old 02-06-2006, 03:16 AM   #6 (permalink)
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Re: Lift pump cam lobe worn off motor.

Was it brand new or remanufactured? When I went through my engine the lobe was in bad shape. That lobe was the only wear part that didn't come in the master rebuild kit. The cam came without it. I couldn't find one anywhere. You may have started with a partially worn lobe.
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